Melbourne’s Metropolitan Fire Brigade said it had been called to “a number of incidents” across the city.
Consulates of the UK, Switzerland, US and Pakistan are among those affected, as well as reportedly several others.
“The packages are being examined by attending emergency services. The circumstances are being investigated,” the Australian Federal Police said.
State police in Melbourne said the incidents were believed to be “targeted and not impacting the general community”.
Emergency workers had been seen at consulates belonging to India, South Korea, New Zealand, Greece, Italy and France according to Australian broadcaster ABC News.
“All our staff are safe and accounted for.”